Engine-valve.



G. P. ABORN.

ENGINE VALVE. APPLICATION FILED JULY 3. 1913.

Patented Apr. 4, 1916.

THE COLUMBIA RLAyOGRAPH c0. WASHINGTON, D. c.

UNITED STATEF fPATEN-tr oFFIGE.

STEAM PUMP WORKS, A

h GEORGE P. ABORN, OF BROOKLINE, MASSACHUSETTS, ASSIGNOR TO BLAKEKNOWLES CORPORATION OF NEW JERSEY. I

ENGINE-VALVE.

Be it known that I, GEORGE P. ABoRN, a

citizen of the United States, residing at -Brookline, county of Norfolkand State of Massachusetts, have invented certain new and usefulImprovements in Engine-Valves, fully described and represented in thefollowing specification'and the accompanying drawings, forming a part ofthe same.

This invention relates to valve gear for steam pumps or other fluidengines and more particularly to cut-01f mechanism embodied in suchvalve gear.

The objects of the invention include .a more simplified mechanismequipped with a cut-off gear whereby greater economy in .the use ofsteam or other motive fluid is .made possible.

While the invention may be utilized in many forms of fluid engines, itis here illustrated in connection with a steam pump having a fluidactuated valve gear of a well known type.

Inthe drawings, Figure 1 is a sectional elevation taken longitudinallythrough the main and auxiliary'steam cylinders on line 1 -1 of Fig. 2,Fig. 2 is a sectional elevation taken on the line 2-2 of Fig. 1, Fig. 3is a a sectional plan taken on the line 8- 3 of Fig. 1, Fig. 4 is a planof the valve seat for the main slide valve, and Fig. 5 is a plan of themain slide valve.

' The main steam cylinder is indicated. at

10, the piston 11 and-the inte Valli? seat at 12. The main inlet portsin the valve seat are shown at 13 and 14 and the exhaust at .15. Bleederports, forming a second set of inlet ports, 16 and 17 are also formed inthe valve seat and communicate by'respective passages withthemainiinlet. ports by short channels as indicated at 18 in Fig. 2. Thebleeder channels are controlled by hand valves19-and 20.

The main slide valve 21, shown in Figs. 1 and 5, is a D valve of theAllen 0r Trick type, this form being preferred as it efiects the cut-offwith a minimum of travel. The valve is divided laterally into twosections, lettered and b in Fig. 5. Section a cooperates with the mainports 13, 14, 15, and is provided with lap to close the ports early inthe stroke and effect a cut-oif of the steam. Section I) cooperates withthe bleeder ports, and having no lap, as shown, forms the full strokevalve, these ports, 16 and 17, being Application filed 111173, 1913.-seriaino.777,155. f

Patented Apr. 4,191

open successively to the steam pressure 1 ing the full stroke orapproximately the full stroke of piston 11. h

It will be noticed that if thevalves 19 and 20 areclosed steam isadmitted to cylinder 10 only through the a section of the valve, and theengine operates with the expansion of steam; if the valves 19 and 20 areopened, the steam passes through the bleeder ports and passages 18 tothe main inlet ports,

therebysupplying steam-"to cylinder 10 throughout the full stroke orapproximately the full stroke of piston 11. The valve21 ;1s equippedwith a stem 22 which passes through a yoke 23 and connects at its upperend with the auxiliary piston 24locat ed in auxiliary steam cylinder 25.The yoke 23 is moved by a balanced valve rod 26 and'the proportions ofthe yoke and stem are such that there is a certain amount of lost motionbetween them. The yoke carries at one side the auxiliary slide valve 27which cooperates With'an auxiliary valve seat located at one side of thecylinder 25, as best shown in Fig.

This valve seat is provided with-admission ports 28 and 29 and exhaustports 30, 31 and 32, the latter threeports communicating with theexhaust 'port 33' located as shown in Figs. 2 and 4.

I The described mechanism operates as follows :Assuming the parts to bein the position shown in Fig- 1, ste-am' will pass through inlet 34(Fig. 2) into chamber 35 and up through opening 36 into the auxiliarycylinder and into port 13 past the right hand edge of main valve 21andvalso through the port 87 in the main valve. The piston 11 wi-llmoveto the-left and steam will exhaust through port 14, under valve 21, andport 15. 7 V I I At a'predeter'mined point in thetravel of main piston11, the usual valve actuating 26-and move 1t toward the right, carryingwith it the yoke 23 and auxiliary valve 27.

The movement of the auxiliary valve to the right first uncovers steamport 28 and closes exhaust port 30, admitting steam at the left of theauxiliary piston through port 38 which balances the auxiliary piston asports 29 and 39 are open to steam at the opposite end.

As soon s the auxiliary piston is balanced, the yoke 23 will come intocontact with the stem 22 of t in alv an the continued movement of theyoke will carry the valve to the right. Less than a sixth of the totaltravel of the main valve will close the port 13 and thus shutting offthe supply of steam from the piston 11, thestroke of which will becompleted by the expansion of the steam previously admitted to thecylinder.

Just before the main valve 21 reaches its central position, theauxiliary valve 27 will have moved far enough to open exhaust port andclose steam port 29, and the auxiliary piston now being unbalanced willbe driven over to the right, stopping when the right end of theauxiliary piston has closed the exhaust port 40, causing the piston tocushion on the steam confined between its end and the auxiliary cylinderhead. The main valve 21 will now be in position for the return stroke ofthe main piston 11.

As previously described, if it be desired to have the steam' follow fullstroke, the bleeder valves 19 and, 20 are opened, admitting steam to themain ports 13 and 14: independently of the action of the cut-offarrangement, this admission being controlled by the'o sectionot' themain valve 21.

While the main valve 21 is shown as double ported for the purpose ofreducing its travel, it is to be understood that the invention is not tobe limited to this particular type of valve,it being obvious that anordinary single ported valve, if made with sufiicientlap and given thenecessary travel could. be made to accomplish the same re- Suits asregards the cut-oil and its cooperationwiththe other parts of the valve.

What is claimed 1. In combination, a main valve having a cut-off lap, apiston connected with said main valve to move it, a: cylinder in whichsaid piston is located, a valve chest for said main valve interposed"between said cylinder andthe scatter the said mainvalve, an auxiliaryvalve located in said valve chest and cooperatingwith said main. valveto mechanically move the latterand to permit the; main valve to: be:moved by its piston independently of said auxiliary valve andcooperating with a valve seat: having ports connecting. said valve chestwith said cyl- Copie 'ot this: patent may be obtained. for five centseach, by

inder, means to operate said auxiliary valve, and means independent ofthe main valve for controlling the steam admission for full stroke.

2. In combination, a main valve having both an extended and a normal lapfor early and, late closing of steam admission, a piston connected withsaid main valve to move it, a cylinder in; which said piston is locateda valve chest for said main valve interpose between said cylinder andthe seat for the said main. valve, an auxiliary valve located in saidvalve chest and cooperating with said main valve to mechanically movethe latter and to permit the main valve to be moved by its. pistonindependently of said auxiliary valve and cooperating with a valve seathaving ports connecting said valve chest with said cylinder, and meansto operate said auxiliary valve.

3. In combination, a main. valve having both an extended and a normallap for early and late closing of steam admission, a' transverse stemfor the main valve, apiston connected with the stem and adapted to movethe main valve, a cylinder in which said piston is located, a valvechest for said main valve interposed between said cylinder and the seatfor the main valve, an auxiliary valve located. in: said valve chest,the said auxiliary valve being equipped with a yoke surrounding the stemof the main valve and having lost motion relative thereto, where by theauxiliary valve and its yokeare adapted to'cooperate with said mainvalve to mechanically move the latter and to perk mit themainvalve to bemoved. by its piston independently of said auxiliary valve and itsyoke,the-auxiliary valve further-cm operating with a valve seat having portsconnecting. said" valve chest with said: cylinder, and means to operatesaid auxiliary valve.- 7

In testimony whereof, I have hereunto set my hand, in the presence oftwo sub 7 scribing witnessesi GEORGE P. ABORN;

Witnesses: a 7

JOHN J. Frmsnr, FRANK P; STEARNs.

addressing the Commissioner 0! Patents;

Washington, IDs-CI"

